On Business2Community.com Carey Wodehouse writes about why SASS is an indispensable part of web developing.

On her list of benefits to working with SASS are: Variables, less code, better responsive design, code snippets, more modularity and the power of nesting.

Make your CSS even more modular—and easier to work with. The more complicated an app gets, the bigger its CSS stylesheet gets, leading to more complex code that is harder to maintain. But that doesn’t mean it has to be a pain—and Sass takes care of this with “partials.” Partials are essentially code snippets, like the ones you’d find in libraries. These keep larger files more modular, but they don’t get compiled to CSS because they’re not complete files. Think of them as building blocks within Sass, and ways to maintain cleaner code in a logical way.
Read more at http://www.business2community.com/brandviews/upwork/6-reasons-sass-every-front-end-developers-toolbox-01637839#41VIS6XydXxArfzy.99

Read it.